Download Notes Naming Angles

Angle
Two rays connecting at one point
Angle
Angle
Two rays connecting at one point
Ray
Has exactly one endpoint (starting point) and
no end
Ray
Angle
Two rays connecting at one point
Ray
Has exactly one endpoint (starting point)
and no end
Opposite rays
Two rays that share a common endpoint
Opposite Rays
Angle
Two rays connecting at one point
Ray
Has exactly one endpoint (starting point)
and no end
Opposite rays
Two rays that share a common endpoint
Sides
Two rays make up the sides of the angle
Side
Side
Vertex
The common endpoint of two rays
Vertex
Vertex
The common endpoint of two rays
Interior Points
Points that lie on inside of the angle
Interior
Vertex
The common endpoint of two rays
Interior Points
Points that lie on the inside of the angle
Exterior Points
Points that lie on the outside of the angle
Exterior
Degrees
The unit used to measure angles
50
Degrees
The unit used to measure angles
Congruent Angles
Angles that have the same measure
m<ABC
This is read as “The measure of angle ABC”
Right angle
An angle with a measure of 90
90
Right Angle
Acute angle
An angle with a measure that is greater than
0 but less than 90
30
Acute Angle
Acute angle
An angle with a measure that is greater
than 0 but less than 90
Obtuse angle
An angle with a measure that is greater
than 90 but less than 180
135
Obtuse Angle
Acute angle
An angle with a measure that is greater
than 0 but less than 90
Obtuse angle
An angle with a measure that is greater
than 90 but less than 180
Straight Angle
An angle with a measure of 180
Straight Angle
Notes
Naming Angles – Angles are named with three
letters; the point of one ray, the common vertex,
and the point of the other ray
Angle Addition Postulate – If R is in the interior of
<PQS, then m<PQR + m<RQS = m<PQS. If the
m<PQR + m<RQS = m<PQS, then R is in the interior
of <PQS